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Wyszukujesz frazę "thermal mass" wg kryterium: Temat


Tytuł:
Natural ventilation and energy efficiency in non-domestic buildings
Autorzy:
Pieczara, J.
Powiązania:
https://bibliotekanauki.pl/articles/101474.pdf
Data publikacji:
2017
Wydawca:
Polska Akademia Nauk. Stowarzyszenie Infrastruktura i Ekologia Terenów Wiejskich PAN
Tematy:
natural ventilation
adaptive thermal comfort
energy efficiency
air quality
passive cooling
risk of overheating
thermal mass
Opis:
Over the past 50 years the use of air conditioning in non-domestic buildings has become a norm and an indicator of status. Today the rediscovering of the natural ventilation is a part of rediscovering the buildings’ energy efficiency, or maybe even a part of a wider approach, which is a desire to be closer to nature. The main task of all ventilation systems is to maintain an appropriate indoor air quality and to improve the indoor environment. Natural ventilation systems could do the above using less energy than mechanical systems. However, it requires also the implementation of other passive measures. The most important of them are: the reduction of the harmful air contaminants, the control of heat gains, the exposition of the building’s thermal mass and utilisation of the night cooling. Because of energy efficiency and thermal comfort reasons, in temperate climate ventilation systems have to work according to at least three scenarios: spring/autumn, winter and summer. The thermal comfort parameters in naturally ventilated buildings are usually more variable than in air-conditioned ones, what does not mean that the occupants will experience thermal discomfort. Therefore, thermal comfort in passively ventilated buildings should be evaluated according to the adaptive comfort standard, appropriated for the naturally ventilated buildings. The natural ventilation has its limits and probably not all buildings can be ventilated naturally. From the energy efficiency and thermal comfort reasons, implementing the mixed mode systems is sometimes more feasible. However, the real reason why the full potential of natural ventilation could not be explored is very often the lack of confidence in relying exclusively on it.
Źródło:
Infrastruktura i Ekologia Terenów Wiejskich; 2017, III/1; 935-947
1732-5587
Pojawia się w:
Infrastruktura i Ekologia Terenów Wiejskich
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Precise measurement of chlorine isotopes by thermal ionization mass spectrometry
Autorzy:
Neskovic, O.
Veljkoviç, M.
Velickoviç, S.
Deriç, A.
Miljeviç, N.
Golobocanin, D.
Powiązania:
https://bibliotekanauki.pl/articles/147003.pdf
Data publikacji:
2002
Wydawca:
Instytut Chemii i Techniki Jądrowej
Tematy:
chlorine isotopes
mass spectrometry
thermal ionization
Opis:
A procedure for the determination of chlorine isotopic ratios by positive thermal ionization mass spectrometry of the Cs2Cl+ ion has been investigated. The chlorine isotopic composition in CsCl spectroscopically pure has been measured with a precision of 0.034. The chlorine composition in sea water samples has also been determined.
Źródło:
Nukleonika; 2002, 47,suppl.1; 85-87
0029-5922
1508-5791
Pojawia się w:
Nukleonika
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Functional plasma-deposited coatings
Autorzy:
Pashechko, M.
Kindrachuk, M.
Gumeniuk, I.
Tisov, O.
Zahrebelniy, V.
Powiązania:
https://bibliotekanauki.pl/articles/957956.pdf
Data publikacji:
2017
Wydawca:
Stowarzyszenie Inżynierów i Techników Mechaników Polskich
Tematy:
plasma deposition
coating
laser treatment
thermal cycling
mass transfer
adhesion
wear resistance
Opis:
The paper focuses on the problem of low adhesion of plasma sprayed coatings to the substrate. The subsequent laser treatment modes and their influence on the coating-substrate interface were studied. This allows to decrease the level of met-stability of the coating, thus decreasing its hardness down to 11–12 GPa on the surface and to about 9 GPa on depth of 400 μm. The redistribution of alloying elements through solid and liquid diffusion improves mechanical properties and rises the adhesion up to 450 MPa after remelting and up to 90–110 MPa after laser-aided thermal cycling. At the same time, remelting of coating helps to decrease its porosity down to 1%. The obtained complex of properties also allows to improve wear resistance of coatings and to decrease friction factor.
Źródło:
Advances in Science and Technology. Research Journal; 2017, 11, 4; 301-304
2299-8624
Pojawia się w:
Advances in Science and Technology. Research Journal
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Correlation analyses of Baltic Sea winter water mass formation and its impact on secondary and tertiary production
Autorzy:
Hinrichsen, H.H.
Lehmann, A.
Petereit, C.
Schmidt, J.
Powiązania:
https://bibliotekanauki.pl/articles/47630.pdf
Data publikacji:
2007
Wydawca:
Polska Akademia Nauk. Instytut Oceanologii PAN
Tematy:
zooplankton
fish egg
development
thermal stratification
winter
water
Baltic Sea
mass formation
survival
Opis:
The thermal stratification of the upper water layers in the Baltic Sea varies seasonally in response to the annual cycle of solar heating and wind-induced mixing. In winter,the stratification down to the halocline is almost completely eroded by convection and strong wind mixing. Monthly averaged temperature profiles obtained from the ICES hydrographic database were used to study the long-term variability (1950 to 2005) of winter water mass formation in different deep basins of the Baltic Sea east of the island of Bornholm. Besides strong interannual variability of deep winter water temperatures,the last two decades show a positive trend (increase of 1–1.5◦C). Correlations of winter surface temperatures to temperatures of the winter water body located directly above or within the top of the halocline were strongly positive until the autumn months. Such a close coupling allows sea surface temperatures in winter to be used to forecast the seasonal development of the thermal signature in deeper layers with a high degree of confidence. The most significant impact of winter sea surface temperatures on the thermal signature in this depth range can be assigned to February/March. Stronger solar heating during spring and summer results in thermal stratification of the water column leading to a complete decoupling of surface and deep winter water temperatures. Based on laboratory experiments,temp erature-dependent relationships were utilised to analyse interannual variations of biological processes with special emphasis on the upper trophic levels (e.g.,stage-sp ecific developmental rates of zooplankton and survival rates of fish eggs).
Źródło:
Oceanologia; 2007, 49, 3
0078-3234
Pojawia się w:
Oceanologia
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The human bodys response to the conditions in the sauna
Autorzy:
Borysławski, Krzysztof
Szaliłow, Karolina
Bielec, Grzegorz
Omelan, Aneta
Podstawski, Robert
Powiązania:
https://bibliotekanauki.pl/articles/1933106.pdf
Data publikacji:
2021-07-14
Wydawca:
PPHU Projack Jacek Wąsik
Tematy:
thermal stress
blood pressure
heart rate
body mass loss
participants from different age groups
Opis:
Aim: The aim of this study was to determine the effect of a 15-minute bathing session in a Finnish sauna on changes in systolic and diastolic blood pressure (SBP and DBP, respectively), heart rate (HR), and body mass. The effects of grouping variables (age, sex, BMI, frequency of sauna use, history of sauna use) were taken into account in the analysis. Materials and Methods: A total of 60 women (33.6±13.1) and 42 men (33.8±12.5) aged 17 to 79 participated in one 15-minute sauna session (temperature: 90-91°C; relative humidity: 14-16%) in December 2019, in the city of Wrocław, Poland. The participants' body mass, SBP, DBP and HR were measured before and after sauna. Body height was measured only before sauna. Results: Sauna induced significant changes in the participants' physiological parameters. Systolic blood pressure decreased (p<0.05) in both sexes, in older participants (p<0.001) regardless of their BMI, and in participants who had rarely used sauna and had used sauna for a minimum of several years. A significant decrease in DBP (p<0.001) and HR values and a significant loss of body fluids (p<0.001) was noted in both sexes regardless of age, BMI, frequency and history of sauna use. Conclusions: A 15-minute sauna session has a beneficial effect on the circulatory system and can be incorporated into cardiovascular therapies. Regular sauna use is an important factor, and optimal results can be achieved by visiting sauna several times a week.
Źródło:
Physical Activity Review; 2021, 2, 9; 11-17
2300-5076
Pojawia się w:
Physical Activity Review
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The influence of thermal expansion on flow past an inclined accelerated sectional plate with persistent mass diffusion
Autorzy:
Nagarajan, G.
Sundar Raj, M.
Muthucumaraswamy, R.
Powiązania:
https://bibliotekanauki.pl/articles/27312397.pdf
Data publikacji:
2022
Wydawca:
Uniwersytet Zielonogórski. Oficyna Wydawnicza
Tematy:
rozszerzalność cieplna
dyfuzja masy
transformata Laplace'a
thermal expansion
mass diffusion
accelerated
inclined plate
isothermal
Opis:
In this article, we examined the solution of a homogeneously intensified isothermal inclined infinite plate with constant temperature. The plate is elevated to Tw, and the species accumulation is enhanced at a consistent speed. Under appropriate boundary conditions, the non-dimensional guiding formulae are remedied using the Laplace transform procedure. The effect of velocity, temperature, and concentration on various factors, including thermal and mass Grashof numbers, Schmidt numbers, and duration, is discussed. The velocity increases proportionally to the thermal and mass Grashof numbers, but decreases as the inclined angle, Schmidt numbers and time increase.
Źródło:
International Journal of Applied Mechanics and Engineering; 2022, 27, 4; 105--116
1734-4492
2353-9003
Pojawia się w:
International Journal of Applied Mechanics and Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Effects of atmospheric circulation on water temperature along the Southern Baltic Sea coast
Autorzy:
Girjatowicz, J.P.
Swiatek, M.
Powiązania:
https://bibliotekanauki.pl/articles/48210.pdf
Data publikacji:
2019
Wydawca:
Polska Akademia Nauk. Instytut Oceanologii PAN
Tematy:
atmospheric circulation
water temperature
surface temperature
thermal property
air mass
correlation
Baltic Sea
coastal zone
Źródło:
Oceanologia; 2019, 61, 1
0078-3234
Pojawia się w:
Oceanologia
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Experimental and numerical investigation of thermal flow meter
Autorzy:
Cebula, A.
Powiązania:
https://bibliotekanauki.pl/articles/240345.pdf
Data publikacji:
2015
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
mass flowmeter
heat transfer
uniform heat flux
thermal model
miernik przepływu
wymiana ciepła
model termiczny
Opis:
The paper presents analytical and numerical model calculation results of the temperature distribution along the thermal flow meter. Results show a very good conformity between numerical and analytical model. Apart from the calculation results the experimental investigations are presented. The author performed the test where a temperature of duct wall surface was measured. Therelation between mass flow rate in terms of the duct surface temperature difference was developed.
Źródło:
Archives of Thermodynamics; 2015, 36, 3; 149-160
1231-0956
2083-6023
Pojawia się w:
Archives of Thermodynamics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Application of gas chromatography to evaluate the quality of rapeseed oil
Autorzy:
Lubinska, Martyna
Namieśnik, Jacek
Powiązania:
https://bibliotekanauki.pl/articles/1179570.pdf
Data publikacji:
2017
Wydawca:
Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:
edible oils
mass spectrometry
quality markers
thermal degradation
two-dimensional gas chromatography
volatile organic compounds
Opis:
Two-dimensional gas chromatography is an analytical technique, which is increasingly being used in food research. Through the analysis of volatile fraction, it is possible to determine the quality of food products. One of the reasons for the deterioration of food is thermal degradation. Products that are often subject to degradation reactions due to temperatures are edible oils. In the thesis, the results of edible oils with different botanical origin are presented. The samples of oil were heated at temperatures of 20 °C, 60 °C, 100 °C, 140 °C and 180 °C. Based on the results of the chromatographic analysis, potential indicators of thermal degradation of edible oils were selected. The last step was to quantify the selected compounds to confirm that the typed chemical compounds are the markers of thermal decomposition of cooking oils. To calibrate, the method of standard additions was chosen
Źródło:
World Scientific News; 2017, 75; 96-105
2392-2192
Pojawia się w:
World Scientific News
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Application of the TG-MS system in studying sewage sludge pyrolysis and gasification
Autorzy:
Bedyk, T.
Nowicki, L.
Stolarek, P.
Ledakowicz, S.
Powiązania:
https://bibliotekanauki.pl/articles/778663.pdf
Data publikacji:
2008
Wydawca:
Zachodniopomorski Uniwersytet Technologiczny w Szczecinie. Wydawnictwo Uczelniane ZUT w Szczecinie
Tematy:
osad ściekowy
piroliza
gazyfikacja
analiza termiczna
spektrometria masowa
sewage sludge
pyrolysis
gasification
thermal analysis
mass spectrometry
Opis:
A method of monitoring sewage sludge pyrolysis and gasification was proposed. Samples of sludge were pyrolysed in Ar and gasified in CO2 in a thermobalance. The evolved gases were analysed on the calibrated MS, the samples of sludge and solid residues at different stages of the processes were subjected to elemental analysis. The identification and the quantitative characterisation of chemical reactions were performed, based on the DTG and MS profiles.
Źródło:
Polish Journal of Chemical Technology; 2008, 10, 1; 1-5
1509-8117
1899-4741
Pojawia się w:
Polish Journal of Chemical Technology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Method of a choice of parameters of the air cooling machine of a cascade pressure exchange
Metod vybora parametrov vozdushnojj kholodilhojj mashiny kaskadnogo obmena davleniem
Autorzy:
Krajniuk, A.
Starcheous, Y.
Danileychenko, A.
Bryantsev, M.
Powiązania:
https://bibliotekanauki.pl/articles/791920.pdf
Data publikacji:
2012
Wydawca:
Komisja Motoryzacji i Energetyki Rolnictwa
Tematy:
cascade pressure exchanger
mass exchange
air cooling machine
refrigerating capacity
mechanical energy
thermal energy
algorithm
calculation method
calculation
Źródło:
Teka Komisji Motoryzacji i Energetyki Rolnictwa; 2012, 12, 4
1641-7739
Pojawia się w:
Teka Komisji Motoryzacji i Energetyki Rolnictwa
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Bidirectionally stretched flow of Jeffrey liquid with nanoparticles, Rosseland radiation and variable thermal conductivity
Autorzy:
Archana, M.
Gireesha, B. J.
Rashidi, M. M.
Prasannakumara, B. C.
Gorla, R. S. R.
Powiązania:
https://bibliotekanauki.pl/articles/240409.pdf
Data publikacji:
2018
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
heat mass transfer
jeffrey nanofluid
variable thermal conductivity
rosseland approximation
suction
ciepło
masa
zmienna przewodność cieplna
aproksymacja
ssanie
Opis:
Heat and mass transfer stretched flow of an incompressible, electrically conducting Jeffrey fluid has been studied numerically. Nanoparticles are suspended in the base fluid and it has many applications such as cooling of engines, thermal absorption systems, lubricants fuel cell, nanodrug delivery system and so on. Temperature dependent variable thermal conductivity with Rosseland approximation is taken into account and suction effect is employed in the boundary conditions. The governing partial differential equations are first transformed into set of ordinary differential equations using selected similarity transformations, which are then solved numerically using Runge-Kutta-Felhberg fourth-fifth order method along with shooting technique. The flow, heat and mass transfer characteristics with local Nusselt number for various physical parameters are presented graphically and a detailed discussion regarding the effect of flow parameters on velocity and temperature profiles are provided. It is found that, increase of variable thermal conductivity, radiation, Brownian motion and thermophoresis parameter increases the rate of heat transfer. Local Nusselt number has been computed for various parameters and it is observed that, in the presence of variable thermal conductivity and Rosseland approximation, heat transfer characteristics are higher as compared to the constant thermal conductivity and linear thermal radiation.
Źródło:
Archives of Thermodynamics; 2018, 39, 4; 33--57
1231-0956
2083-6023
Pojawia się w:
Archives of Thermodynamics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Emission of volatile organic compounds (VOC) from waterborne lacquers with different content of solids
Emisja lotnych związków organicznych (VOC) z wodorozcieńczalnych wyrobów lakierowych o zróżnicowanej zawartości ciał stałych
Autorzy:
Stachowiak-Wencek, A.
Pradzynski, W.
Powiązania:
https://bibliotekanauki.pl/articles/52642.pdf
Data publikacji:
2011
Wydawca:
Sieć Badawcza Łukasiewicz - Instytut Technologii Drewna
Tematy:
emission
volatile organic compound
lacquer
solid content
water-borne lacquer
gas chromatography-mass spectrometry
thermal desorption
wood-based material
wood
Opis:
This paper presents the results of investigations on the emission of volatile organic compounds (VOC) from oak wood surfaces finished with acrylic waterborne lacquers. The lacquers selected for the experiments were characterised by a different content of solids, fluctuating between 32 and 38%. The volatile organic compounds were analysed using a gas chromatography technique combined with mass spectrometry and thermal desorption (GC/MS/TD). Tenax TA was employed as an adsorption medium. The obtained results indicate that volatile organic compound emissions from the experimental waterborne lacquers varied widely from 388 to 1794 μg/m3. The most important constituents of emissions included compounds that belonged mainly to glycol ethers as well as aliphatic and aromatic hydrocarbons.
Przedstawiono wyniki badań emisji lotnych związków organicznych z powierzchni drewna dębowego, uszlachetnionego akrylowymi lakierami wodorozcieńczalnymi. Użyte wyroby lakierowe charakteryzowały się różną zawartością ciał stałych, która zmieniała się w zakresie od 32 do 38%. Lotne związki organiczne analizowano techniką chromatografii gazowej połączonej ze spektrometrią mas i termiczną desorpcją (GC/MS/TD). Jako medium adsorpcyjne zastosowano Tenax TA. Uzyskane rezultaty wskazują, iż emisja lotnych związków organicznych z wyrobów wodorozcieńczalnych zmieniała się w szerokim zakresie, od 388 do 1794 μg/m3. Głównymi składnikami emisji były związki należące w większości do eteroglikoli, węglowodorów alifatycznych oraz aromatycznych.
Źródło:
Drewno. Prace Naukowe. Doniesienia. Komunikaty; 2011, 54, 186
1644-3985
Pojawia się w:
Drewno. Prace Naukowe. Doniesienia. Komunikaty
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Radiation and chemical reaction effects on MHD flow along a moving vertical porous plate
Autorzy:
Reddy, G. V. R.
Reddy, N. B.
Gorla, R. S. R.
Powiązania:
https://bibliotekanauki.pl/articles/265207.pdf
Data publikacji:
2016
Wydawca:
Uniwersytet Zielonogórski. Oficyna Wydawnicza
Tematy:
magnetohydrodynamika
porowatość
promieniowanie cieplne
wymiana ciepła
wymiana masy
reakcja chemiczna
MHD
porous medium
thermal radiation
heat and mass transfer
chemical reaction
Opis:
This paper presents an analysis of the effects of magnetohydrodynamic force and buoyancy on convective heat and mass transfer flow past a moving vertical porous plate in the presence of thermal radiation and chemical reaction. The governing partial differential equations are reduced to a system of self-similar equations using the similarity transformations. The resultant equations are then solved numerically using the fourth order Runge-Kutta method along with the shooting technique. The results are obtained for the velocity, temperature, concentration, skin-friction, Nusselt number and Sherwood number. The effects of various parameters on flow variables are illustrated graphically, and the physical aspects of the problem are discussed.
Źródło:
International Journal of Applied Mechanics and Engineering; 2016, 21, 1; 157-168
1734-4492
2353-9003
Pojawia się w:
International Journal of Applied Mechanics and Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Calculation of the thermal dynamic performance of the residential buildings walls
Autorzy:
Kalinović, Saša M.
Djoković, Jelena M.
Nikolić, Ružica R.
Hadzima, Branislav
Powiązania:
https://bibliotekanauki.pl/articles/104140.pdf
Data publikacji:
2019
Wydawca:
Stowarzyszenie Menedżerów Jakości i Produkcji
Tematy:
wall's specific mass
heat conduction coefficient
periodical heat transfer
reduction factor
thermal inertia
ściany
współczynnik przewodzenia ciepła
okresowe przekazywanie ciepła
współczynnik redukcji
bezwładność cieplna
Opis:
Calculation of the thermal dynamic properties of the multi-layer wall isolation of residential buildings is presented in this paper. Taking into account that the final objective is to create a building with the highest energy efficiency ratio, i.e. with the lowest energy consumption, both for heating and cooling, it is necessary to realize the good thermal characteristics of the multi-layer wall. To obtain the optimal solution for the wall's structure, various wall structures with different thicknesses of the individual layers, were analyzed. Based on results, presented in this paper, one can conclude that for walls with the same total thickness, but various thicknesses of the individual layers, that constitute the complete wall structure, the differences appear in the delay of the change of the walls outside temperature. In that way, by varying those individual layers' thicknesses, one can obtain the optimal solution for the wall structure with the highest savings of energy.
Źródło:
Quality Production Improvement - QPI; 2019, 1, 1; 212-221
2657-8603
Pojawia się w:
Quality Production Improvement - QPI
Dostawca treści:
Biblioteka Nauki
Artykuł

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